Americium has today (2011) 19 isotopes and 8 isomers.
All the isotopes of americium are radioactive and unstable.
Because americium isotopes have not very long half lives any possible (probable) primordial americium disappeared many time ago.
Yes, americium is a radioactive metal. This element has no stable isotopes.
As all radioactive elements, isotopes of americium continuously decay.
1. Americium has 19 isotopes aqnd 8 isomers known today; for the complete list see the link below. 2. Isotope: an atom of an element having different number of neutrons.
Americium has 95 protons and electrons. Number of neutrons: atomic mass of an isotope - number of protons
Yes, Americium-241 and other isotopes is potentially harmful if improperly handled because is radioactive.
Americium has (all the isotopes) 95 electrons.
Americium-241 has: 95 protons, 95 electrons, 146 neutrons.For other isotopes the number of neutrons is different.Number of neutrons = Mass number of an isotope - 95
The "ionizing" type of smoke alarms uses Americium.
The most known isotopes of americium are 241Am and 242Am.
For example some useful isotopes: 241Am, 242mAm, 243Am.